From: Geert Uytterhoeven geert+renesas@glider.be
[ Upstream commit 2cba05451a6d0c703bb74f1a250691404f27c4f1 ]
If the parent GPIO controller is a sleeping controller (e.g. a GPIO controller connected to I2C), getting or setting a GPIO triggers a might_sleep() warning. This happens because the GPIO Aggregator takes the can_sleep flag into account only for its internal locking, not for calling into the parent GPIO controller.
Fix this by using the gpiod_[gs]et*_cansleep() APIs when calling into a sleeping GPIO controller.
Reported-by: Mikko Salomäki ms@datarespons.se Fixes: 828546e24280f721 ("gpio: Add GPIO Aggregator") Signed-off-by: Geert Uytterhoeven geert+renesas@glider.be Reviewed-by: Andy Shevchenko andy.shevchenko@gmail.com Signed-off-by: Bartosz Golaszewski brgl@bgdev.pl Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpio/gpio-aggregator.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-)
diff --git a/drivers/gpio/gpio-aggregator.c b/drivers/gpio/gpio-aggregator.c index 34e35b64dcdc0..23047dc84ef1b 100644 --- a/drivers/gpio/gpio-aggregator.c +++ b/drivers/gpio/gpio-aggregator.c @@ -273,7 +273,8 @@ static int gpio_fwd_get(struct gpio_chip *chip, unsigned int offset) { struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
- return gpiod_get_value(fwd->descs[offset]); + return chip->can_sleep ? gpiod_get_value_cansleep(fwd->descs[offset]) + : gpiod_get_value(fwd->descs[offset]); }
static int gpio_fwd_get_multiple(struct gpiochip_fwd *fwd, unsigned long *mask, @@ -292,7 +293,10 @@ static int gpio_fwd_get_multiple(struct gpiochip_fwd *fwd, unsigned long *mask, for_each_set_bit(i, mask, fwd->chip.ngpio) descs[j++] = fwd->descs[i];
- error = gpiod_get_array_value(j, descs, NULL, values); + if (fwd->chip.can_sleep) + error = gpiod_get_array_value_cansleep(j, descs, NULL, values); + else + error = gpiod_get_array_value(j, descs, NULL, values); if (error) return error;
@@ -327,7 +331,10 @@ static void gpio_fwd_set(struct gpio_chip *chip, unsigned int offset, int value) { struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
- gpiod_set_value(fwd->descs[offset], value); + if (chip->can_sleep) + gpiod_set_value_cansleep(fwd->descs[offset], value); + else + gpiod_set_value(fwd->descs[offset], value); }
static void gpio_fwd_set_multiple(struct gpiochip_fwd *fwd, unsigned long *mask, @@ -346,7 +353,10 @@ static void gpio_fwd_set_multiple(struct gpiochip_fwd *fwd, unsigned long *mask, descs[j++] = fwd->descs[i]; }
- gpiod_set_array_value(j, descs, NULL, values); + if (fwd->chip.can_sleep) + gpiod_set_array_value_cansleep(j, descs, NULL, values); + else + gpiod_set_array_value(j, descs, NULL, values); }
static void gpio_fwd_set_multiple_locked(struct gpio_chip *chip,